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The rhgb and quiet parameters can be removed in order to enable system messages.

4) press Ctrl then (while still pressing Ctrl) click on “X”. Now you will enter to tty terminal, in above example, when will prompt you for login credentials ….. .

Notes:

rbgd: mean to boot up using the standard boot splash screen.

quit: mean print no boot messages.

text: mean use text mode.

1: mean boot to single user mode (also, called boot single, rescue shell, or emergency shell). [you will get, a root shell from which you don’t have to log in. This shell is a single process environment which doesn't run init scripts. The root shell will let you do anything with root powers you need to on the system to repair it if you can. You would need to know what you have to do of course, and what commands you need to accomplish it.]
Single user mode can be useful for checking and repairing operating systems. For example, it is used for:
- running fsck (which is used to check and repair filesystems) on a /usr partition because this requires that the partition be unmounted (i.e., not logically attached to the system),
- reset root password if you have lost it,
- fix “failed to mount /etc/fstab” error – just to mention the most critical of them,
- & particularly those that have been damaged and will not allow booting (i.e., starting up) into the default GUI (graphical user interface) or console (i.e., text-only) multi-user mode.

3: mean boot to text-only mode. [you will be asked to enter a user & it’s password. You can even select root user.]

5: mean boot to GUI mode (usually the default mode, when no need to type '5' in the already mentioned above kernel line) [you will be asked to select a user & to enter it’s password. You can’t select root user]

N.B: The changes we made to the kernel parameters only affect the current boot, they do not persist.

N.B: The 'c' command, at boot screen, is a basic shell for interacting with grub, it is of no use in our situation.
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